This is due to Google and Yahoo using difference symbol names.
The first one seems to be convertible because there seems to be a common rule, i.e. .DJI* in google = ^DJI* in yahoo. But for XJO, I don't see a general pattern to do the conversion so I'm afraid I can not do anything about it.

I will add .* conversion to the next release. One workaround for now is to create a local yahoo portfolio for yahoo symbols. I remember you had used it? How do you like it?